Help my math skills please be kind

[Fanatical Meat]

I'll admit I should know this. I buy a bag of dirt that is 1.5 cubic feet how big of an area should that cover at 1 inch thick? First I was thinking 18x18x18 = 5832 but when I searched 1.5 cubic feet = 2592 cubic inches, this number sounds a lot more realistic.
What the hell am I doing wrong?

*I get the square root portion to figure out area

 

[Viper GTS]

1.5 cubic feet would be 12x12x18, not 18x18x18.

Think 1x1x1.5 vs 1.5x1.5x1.5.

Viper GTS

 

[Fanatical Meat]

1.5 cubic feet would be 12x12x18, not 18x18x18.

Think 1x1x1.5 vs 1.5x1.5x1.5.

Viper GTS

Ah that's it. Thank you!

 

[veri745]

~2500 cu in. Would give you an area ~ 50" x 50"

 

[dave_the_nerd]

Math handled.

What are you covering that you only need topsoil to be 1" thick?

 

[Fanatical Meat]

Math handled.

What are you covering that you only need topsoil to be 1" thick?

Some new grass, my existing soil is poor and packed tight.

 

[Ruptga]

Fuck math, that's what computers are for.
http://www.wolframalpha.com/input/?i=(1.5ft^3)/1in^2+in+inches

 

[Cappuccino]

Pretty simple if you know the core.

Multiply the length, width and height figures together, giving you a total in cubic inches then divide the total by 1728 (as there are 1728 cubic inches in a cubic foot).
0.3048 metres in length. One cubic foot is the equivalent to approximately 0.02831685 cubic metres, or 28.3169 litres.
So
1 cubic feet = 12 inch 1 inch = 0.0005787037037037037 cubic feet / 1 inch square 3 in your scientific calculator and round it up on the nearest 10th.

Do you understand?

 

[Humpy]

I'm not sure it's worth doing the math but it's easy to visualize.

1 cubic foot is 12 layers of 1" x 12" x 12" units. So, 12 square feet of coverage at 1" thick.

1.5 cubic feet is 18 layers of 1" x 12" x 12", so 18 square feet.

 

[Cappuccino]

I'm not sure it's worth doing the math but it's easy to visualize.

1 cubic foot is 12 layers of 1" x 12" x 12" units. So, 12 square feet of coverage at 1" thick.

1.5 cubic feet is 18 layers of 1" x 12" x 12", so 18 square feet.

No. Where did you get 12 layers wrong? The formula is wrong because area is not 12 layers and we don't know what is 1 thick of the cube yet.

 

[Fanatical Meat]

Pretty simple if you know the core.

Multiply the length, width and height figures together, giving you a total in cubic inches then divide the total by 1728 (as there are 1728 cubic inches in a cubic foot).
0.3048 metres in length. One cubic foot is the equivalent to approximately 0.02831685 cubic metres, or 28.3169 litres.
So
1 cubic feet = 12 inch 1 inch = 0.0005787037037037037 cubic feet / 1 inch square 3 in your scientific calculator and round it up on the nearest 10th.

Do you understand?

Is this that "new math" stuff they teach in school today?
Much respect Cappuccino but I prefer the 12x12x18 formula.

 

[Humpy]

No. Where did you get 12 layers wrong? The formula is wrong because area is not 12 layers and we don't know what is 1 thick of the cube yet.

1 cubic foot = 12 layers 1" thick = 12 square feet of coverage at 1" thick.

Add the other 1/2 cubic foot to get 18 square feet of coverage.

 

[Cappuccino]

1 cubic foot = 12 layers 1" thick = 12 square feet of coverage at 1" thick.

Add the other 1/2 cubic foot to get 18 square feet of coverage.

How did OP get 2592 cubic inches lol? I can't find what he done to get that.

 

[Cappuccino]

Is this that "new math" stuff they teach in school today?
Much respect Cappuccino but I prefer the 12x12x18 formula.

I finish uni last year but i was just chatting rubbish. Do you understand why you got 2592 cubic inches?

 

[Humpy]

How did OP get 2592 cubic inches lol? I can't find what he done to get that.

I'm not sure, I suck a reading but I'm pretty good with bags of dirt.

 

[Fanatical Meat]

I finish uni last year but i was just chatting rubbish. Do you understand why you got 2592 cubic inches?

Yes it's 1.5 feet in other words it's 12"x12"x18"=2592 it's one foot by one foot by one and a half foot.

It's explained in post #2

https://forums.anandtech.com/threads/help-my-math-skills-please-be-kind.2504602/#post-38862415